X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/0c90b88beddd9d5d6dcf777af43afe1817d37d61..14d8cfa18f28586ad296e3e598d0a2a536be0613:/services/api/app/controllers/arvados/v1/users_controller.rb

diff --git a/services/api/app/controllers/arvados/v1/users_controller.rb b/services/api/app/controllers/arvados/v1/users_controller.rb
index 52f4b1e5eb..54db521768 100644
--- a/services/api/app/controllers/arvados/v1/users_controller.rb
+++ b/services/api/app/controllers/arvados/v1/users_controller.rb
@@ -29,7 +29,23 @@ class Arvados::V1::UsersController < ApplicationController
         end
       end
       if needupdate.length > 0
-        u.update_attributes!(needupdate)
+        begin
+          u.update_attributes!(needupdate)
+        rescue ActiveRecord::RecordInvalid
+          loginCluster = Rails.configuration.Login.LoginCluster
+          if u.uuid[0..4] == loginCluster && !needupdate[:username].nil?
+            local_user = User.find_by_username(needupdate[:username])
+            # A cached user record from the LoginCluster is stale, reset its username
+            # and retry the update operation.
+            if local_user.andand.uuid[0..4] == loginCluster && local_user.uuid != u.uuid
+              new_username = "#{needupdate[:username]}conflict#{rand(99999999)}"
+              Rails.logger.warn("cached username '#{needupdate[:username]}' collision with user '#{local_user.uuid}' - renaming to '#{new_username}' before retrying")
+              local_user.update_attributes!({username: new_username})
+              retry
+            end
+          end
+          raise # Not the issue we're handling above
+        end
       end
       @objects << u
     end